Gyokko-ryū Tōjutsu no maki
Gogyō doesn’t mean, as a scholar, I would never translate it as “five elements”, it means the “five phases”. Secondly, it’s not really martial arts, the meaning of the word is deeper than that. It is written, “Gogyō no Gokei Jo”, the five areas,Me, I, Mi, Shu, soku nari (目、意、身、手、足成り). Translation: the five things is the way you look, the eyes, the intention and the way you develop and cultivate the intention, Mi is the flesh, hands and legs. So, it’s how you practice, how you breath, how you condition your body through the technique.
Then, when you understand that, there is the Sangaku (Three learnings; 三学), the three knowledge of the practice, Ichimonji, Jūmonji, Hichō. And you’ll see what’s really cool is that this is just the beginning.
From the Heiho Okugi Sho, by Yamamoto kansuke (1521-1561:
(Thomas Cleary, Secrets of the Japanese Art of Warfare. P.19)
And in another translation from the same document, the Heiho Okugisho:
(Obata Toshishiro, Heiho Okugisho-The Secret of High Strategy. P. 8)